{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:U3WJ6ZSGRZJST4ZFW5SMZK55NP","short_pith_number":"pith:U3WJ6ZSG","canonical_record":{"source":{"id":"1302.6600","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-02-26T21:07:51Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"54dc67a61a0252eba3b1eb08018b6c815405cae653ef33b87dca9ce05a36c7a0","abstract_canon_sha256":"e2abd3e952e61ac72d46b85639eb3126fea0898b0e0a8b469524d85af512776a"},"schema_version":"1.0"},"canonical_sha256":"a6ec9f66468e5329f325b764ccabbd6bd579f0f8f55b4db5f71126ebd3a02805","source":{"kind":"arxiv","id":"1302.6600","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.6600","created_at":"2026-05-18T01:51:27Z"},{"alias_kind":"arxiv_version","alias_value":"1302.6600v1","created_at":"2026-05-18T01:51:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.6600","created_at":"2026-05-18T01:51:27Z"},{"alias_kind":"pith_short_12","alias_value":"U3WJ6ZSGRZJS","created_at":"2026-05-18T12:28:02Z"},{"alias_kind":"pith_short_16","alias_value":"U3WJ6ZSGRZJST4ZF","created_at":"2026-05-18T12:28:02Z"},{"alias_kind":"pith_short_8","alias_value":"U3WJ6ZSG","created_at":"2026-05-18T12:28:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:U3WJ6ZSGRZJST4ZFW5SMZK55NP","target":"record","payload":{"canonical_record":{"source":{"id":"1302.6600","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-02-26T21:07:51Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"54dc67a61a0252eba3b1eb08018b6c815405cae653ef33b87dca9ce05a36c7a0","abstract_canon_sha256":"e2abd3e952e61ac72d46b85639eb3126fea0898b0e0a8b469524d85af512776a"},"schema_version":"1.0"},"canonical_sha256":"a6ec9f66468e5329f325b764ccabbd6bd579f0f8f55b4db5f71126ebd3a02805","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:51:27.041894Z","signature_b64":"siY5fRujaepwV2k30v/ZSsFpdiHifKObXktWGmFUYmv3E6RF5jUlzfKg45IQnhjmCvDyFlqn3T1oTovZKPFuAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a6ec9f66468e5329f325b764ccabbd6bd579f0f8f55b4db5f71126ebd3a02805","last_reissued_at":"2026-05-18T01:51:27.041091Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:51:27.041091Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1302.6600","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:51:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EN/7F45MrslsVF6CPlYWDwzCFQUA6bzueYT68Ph4L+tvEuMwN7MrUNB2lt1BkwwrcMctUrY6KtnPoqz4O+fPBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T13:04:54.541756Z"},"content_sha256":"92604f8ed5eea5bd378bf12bae3a1f8b18984b398a6ec462afb40f37c6b34e09","schema_version":"1.0","event_id":"sha256:92604f8ed5eea5bd378bf12bae3a1f8b18984b398a6ec462afb40f37c6b34e09"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:U3WJ6ZSGRZJST4ZFW5SMZK55NP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Opto-thermal analysis of a lightweighted mirror for solar telescope","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.IM","authors_text":"B. Ravindra, Ravinder K. Banyal, S. Chatterjee","submitted_at":"2013-02-26T21:07:51Z","abstract_excerpt":"In this paper, an opto-thermal analysis of a moderately heated lightweighted solar telescope mirror is carried out using 3D finite element analysis (FEA). A physically realistic heat transfer model is developed to account for the radiative heating and energy exchange of the mirror with surroundings. The numerical simulations show the non-uniform temperature distribution and associated thermo-elastic distortions of the mirror blank clearly mimicking the underlying discrete geometry of the lightweighted substrate. The computed mechanical deformation data is analyzed with surface polynomials and "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.6600","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:51:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NuWeUuN936EK/H8dfK96n5qZZHUIuMjcrt0dF47e0feas72NQa+CyMDsz6MiXbpqKsHuPqCR9A2B4fKRbjG9CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T13:04:54.542428Z"},"content_sha256":"787d257df367fc436928ea8a7d80c516ad7d3618613c091473825def9515c912","schema_version":"1.0","event_id":"sha256:787d257df367fc436928ea8a7d80c516ad7d3618613c091473825def9515c912"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/U3WJ6ZSGRZJST4ZFW5SMZK55NP/bundle.json","state_url":"https://pith.science/pith/U3WJ6ZSGRZJST4ZFW5SMZK55NP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/U3WJ6ZSGRZJST4ZFW5SMZK55NP/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-06T13:04:54Z","links":{"resolver":"https://pith.science/pith/U3WJ6ZSGRZJST4ZFW5SMZK55NP","bundle":"https://pith.science/pith/U3WJ6ZSGRZJST4ZFW5SMZK55NP/bundle.json","state":"https://pith.science/pith/U3WJ6ZSGRZJST4ZFW5SMZK55NP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/U3WJ6ZSGRZJST4ZFW5SMZK55NP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:U3WJ6ZSGRZJST4ZFW5SMZK55NP","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"e2abd3e952e61ac72d46b85639eb3126fea0898b0e0a8b469524d85af512776a","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-02-26T21:07:51Z","title_canon_sha256":"54dc67a61a0252eba3b1eb08018b6c815405cae653ef33b87dca9ce05a36c7a0"},"schema_version":"1.0","source":{"id":"1302.6600","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.6600","created_at":"2026-05-18T01:51:27Z"},{"alias_kind":"arxiv_version","alias_value":"1302.6600v1","created_at":"2026-05-18T01:51:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.6600","created_at":"2026-05-18T01:51:27Z"},{"alias_kind":"pith_short_12","alias_value":"U3WJ6ZSGRZJS","created_at":"2026-05-18T12:28:02Z"},{"alias_kind":"pith_short_16","alias_value":"U3WJ6ZSGRZJST4ZF","created_at":"2026-05-18T12:28:02Z"},{"alias_kind":"pith_short_8","alias_value":"U3WJ6ZSG","created_at":"2026-05-18T12:28:02Z"}],"graph_snapshots":[{"event_id":"sha256:787d257df367fc436928ea8a7d80c516ad7d3618613c091473825def9515c912","target":"graph","created_at":"2026-05-18T01:51:27Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"In this paper, an opto-thermal analysis of a moderately heated lightweighted solar telescope mirror is carried out using 3D finite element analysis (FEA). A physically realistic heat transfer model is developed to account for the radiative heating and energy exchange of the mirror with surroundings. The numerical simulations show the non-uniform temperature distribution and associated thermo-elastic distortions of the mirror blank clearly mimicking the underlying discrete geometry of the lightweighted substrate. The computed mechanical deformation data is analyzed with surface polynomials and ","authors_text":"B. Ravindra, Ravinder K. Banyal, S. Chatterjee","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-02-26T21:07:51Z","title":"Opto-thermal analysis of a lightweighted mirror for solar telescope"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.6600","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:92604f8ed5eea5bd378bf12bae3a1f8b18984b398a6ec462afb40f37c6b34e09","target":"record","created_at":"2026-05-18T01:51:27Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"e2abd3e952e61ac72d46b85639eb3126fea0898b0e0a8b469524d85af512776a","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-02-26T21:07:51Z","title_canon_sha256":"54dc67a61a0252eba3b1eb08018b6c815405cae653ef33b87dca9ce05a36c7a0"},"schema_version":"1.0","source":{"id":"1302.6600","kind":"arxiv","version":1}},"canonical_sha256":"a6ec9f66468e5329f325b764ccabbd6bd579f0f8f55b4db5f71126ebd3a02805","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a6ec9f66468e5329f325b764ccabbd6bd579f0f8f55b4db5f71126ebd3a02805","first_computed_at":"2026-05-18T01:51:27.041091Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:51:27.041091Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"siY5fRujaepwV2k30v/ZSsFpdiHifKObXktWGmFUYmv3E6RF5jUlzfKg45IQnhjmCvDyFlqn3T1oTovZKPFuAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:51:27.041894Z","signed_message":"canonical_sha256_bytes"},"source_id":"1302.6600","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:92604f8ed5eea5bd378bf12bae3a1f8b18984b398a6ec462afb40f37c6b34e09","sha256:787d257df367fc436928ea8a7d80c516ad7d3618613c091473825def9515c912"],"state_sha256":"b10562382ee934dee8a588cad5a54371dab072a5d0d9771b679dcd726037941e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t7lZ5l5R3GO7k2UJy3U9l0rQba4/b7syStI2WFIhzbUT1CvuskJYBsO31YtIRvEoenVwbYE0P1O8eFS1PWU2CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T13:04:54.545854Z","bundle_sha256":"adc4abdf7e238a537cb15e9b1056f1fcf90fa125c68aa6b15d01dbbb02500792"}}